diff --git a/next/logger/encoder.go b/next/logger/encoder.go
index 546358c..f7e69e4 100644
--- a/next/logger/encoder.go
+++ b/next/logger/encoder.go
@@ -1,46 +1,58 @@
 package logger
 
 import (
-	"github.com/fatih/color"
+	"fmt"
+	"github.com/gookit/color"
 	"go.uber.org/zap/zapcore"
 	"time"
 )
 
-func encodeTime(t time.Time, enc zapcore.PrimitiveArrayEncoder) {
+// timeEncoder formats the time as a string.
+func timeEncoder(t time.Time, enc zapcore.PrimitiveArrayEncoder) {
 	enc.AppendString(t.Format("2006-01-02 15:04:05.000"))
 }
 
-func encodeColoredTime(t time.Time, enc zapcore.PrimitiveArrayEncoder) {
-	enc.AppendString(color.WhiteString(t.Format("2006-01-02 15:04:05.000")))
+// timeColoredEncoder formats the time as a colored string
+// with `[XProxy]` prefix.
+func timeColoredEncoder(t time.Time, enc zapcore.PrimitiveArrayEncoder) {
+	enc.AppendString(fmt.Sprintf(
+		"%s %s",
+		color.Cyan.Render("[XProxy]"),
+		color.Gray.Render(t.Format("2006-01-02 15:04:05.000")),
+	))
 }
 
-func encodeCaller(caller zapcore.EntryCaller, enc zapcore.PrimitiveArrayEncoder) {
+// callerEncoder formats caller in square brackets.
+func callerEncoder(caller zapcore.EntryCaller, enc zapcore.PrimitiveArrayEncoder) {
 	enc.AppendString("[" + caller.TrimmedPath() + "]")
 }
 
-func encodeColoredCaller(caller zapcore.EntryCaller, enc zapcore.PrimitiveArrayEncoder) {
-	enc.AppendString(color.MagentaString("[" + caller.TrimmedPath() + "]"))
+// callerColoredEncoder formats caller in square brackets
+// with magenta color.
+func callerColoredEncoder(caller zapcore.EntryCaller, enc zapcore.PrimitiveArrayEncoder) {
+	enc.AppendString(color.Magenta.Render("[" + caller.TrimmedPath() + "]"))
 }
 
-func encodeLevel(level zapcore.Level, enc zapcore.PrimitiveArrayEncoder) {
+// levelEncoder formats log level using square brackets.
+func levelEncoder(level zapcore.Level, enc zapcore.PrimitiveArrayEncoder) {
 	enc.AppendString("[" + level.CapitalString() + "]")
 }
 
-func encodeColoredLevel(level zapcore.Level, enc zapcore.PrimitiveArrayEncoder) {
-	enc.AppendString(func(level zapcore.Level) func(string, ...interface{}) string {
-		switch level {
-		case zapcore.DebugLevel:
-			return color.CyanString
-		case zapcore.InfoLevel:
-			return color.GreenString
-		case zapcore.WarnLevel:
-			return color.YellowString
-		case zapcore.ErrorLevel:
-			return color.RedString
-		case zapcore.PanicLevel:
-			return color.HiRedString
-		default:
-			return color.WhiteString
-		}
-	}(level)("[" + level.CapitalString() + "]"))
+// levelColoredEncoder formats log level using square brackets
+// and uses different colors.
+func levelColoredEncoder(level zapcore.Level, enc zapcore.PrimitiveArrayEncoder) {
+	levelStr := "[" + level.CapitalString() + "]"
+	switch level {
+	case zapcore.DebugLevel:
+		levelStr = color.FgDefault.Render(levelStr)
+	case zapcore.InfoLevel:
+		levelStr = color.Green.Render(levelStr)
+	case zapcore.WarnLevel:
+		levelStr = color.Yellow.Render(levelStr)
+	case zapcore.ErrorLevel:
+		levelStr = color.Red.Render(levelStr)
+	case zapcore.PanicLevel:
+		levelStr = color.LightRed.Render(levelStr)
+	}
+	enc.AppendString(levelStr)
 }
diff --git a/next/logger/interface.go b/next/logger/interface.go
index cc86407..8e34adb 100644
--- a/next/logger/interface.go
+++ b/next/logger/interface.go
@@ -1,6 +1,9 @@
 package logger
 
-import "go.uber.org/zap/zapcore"
+import (
+	"go.uber.org/zap/zapcore"
+	"io"
+)
 
 const (
 	DebugLevel = zapcore.DebugLevel
@@ -37,3 +40,12 @@ func Errorf(template string, args ...interface{}) {
 func Panicf(template string, args ...interface{}) {
 	handle.sugar.Panicf(template, args...)
 }
+
+// AddOutputs adds more plain log outputs.
+func AddOutputs(outputs ...io.Writer) {
+	var writers []zapcore.WriteSyncer
+	for _, output := range outputs {
+		writers = append(writers, zapcore.AddSync(output))
+	}
+	addWrites(writers...)
+}
diff --git a/next/logger/logger.go b/next/logger/logger.go
index 320149d..a778b83 100644
--- a/next/logger/logger.go
+++ b/next/logger/logger.go
@@ -3,59 +3,66 @@ package logger
 import (
 	"go.uber.org/zap"
 	"go.uber.org/zap/zapcore"
+	"os"
 )
 
 type Logger struct {
-	logger *zap.Logger
-	level  *zap.AtomicLevel
-	sugar  *zap.SugaredLogger
+	logger  *zap.Logger
+	level   *zap.AtomicLevel
+	sugar   *zap.SugaredLogger
+	writers []zapcore.WriteSyncer
+	stdCore zapcore.Core
 }
 
 var handle Logger
 
-func logConfig(level zap.AtomicLevel, colored bool) zapcore.EncoderConfig {
+// logConfig generates log config for XProxy.
+func logConfig(colored bool) zapcore.EncoderConfig {
 	config := zapcore.EncoderConfig{
 		ConsoleSeparator: " ",
 		MessageKey:       "msg",
 		LevelKey:         "level",
 		TimeKey:          "time",
 		CallerKey:        "caller",
-		EncodeTime:       encodeTime,
-		EncodeLevel:      encodeLevel,
-		EncodeCaller:     encodeCaller,
+		EncodeTime:       timeEncoder,
+		EncodeLevel:      levelEncoder,
+		EncodeCaller:     callerEncoder,
 	}
 	if colored {
-		config.EncodeTime = encodeColoredTime
-		config.EncodeLevel = encodeColoredLevel
-		config.EncodeCaller = encodeColoredCaller
+		config.EncodeTime = timeColoredEncoder
+		config.EncodeLevel = levelColoredEncoder
+		config.EncodeCaller = callerColoredEncoder
 	}
 	return config
 }
 
 func init() {
-
 	level := zap.NewAtomicLevelAt(DebugLevel)
-
-	writer, _, _ := zap.Open("/dev/stderr", "/root/XProxy/next/lalala.log")
-
 	core := zapcore.NewCore(
-		zapcore.NewConsoleEncoder(logConfig(level, false)),
-		//zapcore.Lock(os.Stderr),
-		writer,
-		level,
+		zapcore.NewConsoleEncoder(logConfig(true)),
+		zapcore.Lock(os.Stderr), level,
 	)
-
-	//zapcore.AddSync()
-	//zap.Open()
-
-	//return core
-
 	logger := zap.New(core, zap.AddCaller())
-
 	handle = Logger{
-		logger: logger,
-		level:  &level,
-		sugar:  logger.Sugar(),
+		logger:  logger,
+		level:   &level,
+		sugar:   logger.Sugar(),
+		writers: []zapcore.WriteSyncer{},
+		stdCore: core,
 	}
+}
 
+// addWrites adds more plain log writers.
+func addWrites(writers ...zapcore.WriteSyncer) {
+	handle.writers = append(handle.writers, writers...)
+	plainCore := zapcore.NewCore(
+		zapcore.NewConsoleEncoder(logConfig(false)),
+		zap.CombineWriteSyncers(handle.writers...),
+		handle.level,
+	)
+	handle.logger = zap.New(
+		zapcore.NewTee(handle.stdCore, plainCore),
+		zap.AddCaller(),
+	)
+	handle.sugar = handle.logger.Sugar()
 }
diff --git a/next/main.go b/next/main.go
index 6fd8c1c..4640261 100644
--- a/next/main.go
+++ b/next/main.go
@@ -1,13 +1,33 @@
 package main
 
-import "XProxy/next/logger"
+import (
+	"XProxy/next/logger"
+	"os"
+)
 
 func main() {
 
-	logger.Debugf("here is %s level", "debug")
-	logger.Infof("here is %s level", "info")
-	logger.Warnf("here is %s level", "warn")
-	logger.Errorf("here is %s level", "error")
+	//logger.Debugf("here is %s level", "debug")
+	//logger.Infof("here is %s level", "info")
+	//logger.Warnf("here is %s level", "warn")
+	//logger.Errorf("here is %s level", "error")
 	//logger.Panicf("here is %s level", "panic")
 
+	fp1, _ := os.Create("demo_1.log")
+	fp2, _ := os.Create("demo_2.log")
+	fp3, _ := os.Create("demo_3.log")
+
+	logger.Debugf("output msg 1 at debug")
+	logger.Infof("output msg 1 at info")
+	logger.Warnf("output msg 1 at warn")
+	logger.AddOutputs(fp1, fp2)
+	logger.SetLevel(logger.InfoLevel)
+	logger.Debugf("output msg 2 at debug")
+	logger.Infof("output msg 2 at info")
+	logger.Warnf("output msg 2 at warn")
+	logger.SetLevel(logger.WarnLevel)
+	logger.AddOutputs(fp3)
+	logger.Debugf("output msg 3 at debug")
+	logger.Infof("output msg 3 at info")
+	logger.Warnf("output msg 3 at warn")
 }